Update utils.kt

[GeorgCantor]

Variable Naming: Changed parent to current to better reflect its role in the loop. This makes it clearer that we are traversing up the hierarchy.

Early Return: Instead of casting parent to KSFile? at the end, we check if current is an instance of KSFile during each iteration. If it is, we return it immediately. This avoids unnecessary casting and enhances readability.

Null Return: The method now directly returns null when no containing file is found, which is more idiomatic in Kotlin.